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Blindness
Blindness
is the state of being sightless. A blind individual is unable to see. Some may
have a limited ability to see objects using special aids or may be able to
perceive light or a light source. All people who are blind experience
sightlessness to various degrees. Blindness can be the result of a variety of
causes.
Cataract
A
cataract is a clouding of the eye’s natural lens. Our eyes’ lens is mainly made
up of water and protein. The proteins are arranged in such a way that the lens
stays clean and light is able to pass through. As we grow older, some of these
proteins may clump together and start to cloud a small area of the lens. This is
a cataract.
Choroideremia
Choroideremia
is a genetic condition that causes progressive loss of vision due to
degeneration of the retina and the choroid. Night blindness is the most common
first symptom. As the disease progresses, there is loss of peripheral vision
(tunnel vision) and later a loss of central vision.
Color Blindness
Color
blindness is the inability to distinguish the differences between certain
colors. Color blindness results from an absence of color-sensitive pigment in
the cone cells of the retina, the nerve layer at the back of the eye.
Diabetic Retinopathy
Diabetic
Retinopathy is a complication brought on by diabetes where the retina, the
lightsensitive tissue that lines the inner surface of the eye, is damaged.
Diabetes causes abnormal changes in the body’s blood sugar levels. High levels
of blood sugar can alter the blood flow to the body’s organs, including the
eyes.
